From the Centers for Disease Control. Cigarette smoking--behavioral risk factor surveillance system, 1988.
D000328:Adult; D015331:Cohort Studies; D004522:Educational Status; D006801:Humans; D008875:Middle Aged; D011159:Population Surveillance; D015995:Prevalence; D012307:Risk Factors; D012907:Smoking / Q000453:epidemiology*; D012959:Socioeconomic Factors; D014481:United States / Q000453:epidemiology